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= 2x + 4x - 5y + 8 - 5
= 6x - 5y + 3
b) (3p + q) + (-2p - 5q + 7)
= 3p - 2p + q - 5q + 7
= p - 4q + 7
c) (3x²+2x-1) + (x² - 5x + 6)
= 3x² - x² + 2x - 5x - 1 + 6
= 2x² - 3x + 5
d) 2(x + 2y - xy) + 5(2x -3y + 5xy)
= 2x + 10x + 4y - 3y -2xy + 25xy
= 12x + y + 23xy